Glacier Bay HDGUSS4 Basic Under Sink Drinking Water Filtration System Customized filtration based on filter selection (filter not included) Installs under the kitchen sink Uses HDX Advanced or Basic Undersink Filters (HDXLTF4, HDXCTF4, HDXVOF4) or any major brands of drop-in style undersink water filters Includes mounting bracket and screws Questions? Contact our customer support center at 1-800-247-1087